Patent No. EP2819528 (titled "Energy-Rich Liquid Nutritional Composition Having Improved Organoleptic Properties") was filed by Nutricia on Feb 28, 2013. The application was issued on Oct 25, 2017.
Modulation of viscosity of liquid nutritional compositions to improve the provision of energy-rich, liquid nutritional compositions suitable for enteral feeding and/or for special medical purposes. The modification includes adding lactic acid to the composition, having a pH in a range of 6 to 8, and micellar casein as major protein source, in a small volume of liquid.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
| Company | Opposition Date | Representative |
|---|---|---|
| NESTLE | Jul 24, 2018 | ELKINGTON AND FIFE |
| ARLA FOODS AMBA | Jul 20, 2018 | GUARDIAN CONSULTING IS |
| FRESENIUS KABI DEUTSCHLAND | Jul 18, 2018 | FRESENIUS KABI DEUTSCHLAND |
| FRIESLANDCAMPINA NEDERLAND | Jul 11, 2018 | FRIESLANDCAMPINA DEPARTMENT |
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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